An Ultralong Low-Temperature Phosphorescent Pentagonal-Prismatic Organometallic Cylinder Featuring Pentaphenylpyrrole-N-Heterocyclic Carbenes  

作　　者：Man Li Yang Li Xin Li Fang Wang Ying-Feng Han 

机构地区：[1]Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an, Shaanxi, 710127 China

出　　处：《Chinese Journal of Chemistry》2023年第12期1431-1436,共6页中国化学（英文版）

基　　金：supported by the National Natural Science Foundation of China(22025107);the National Youth Top-notch Talent Support Program of China,Xi'an Key Laboratory of Functional Supramolecular Structure and Materials;the FM&EM International Joint Laboratory of Northwest University.

摘　　要：A pentagonal-prismatic cylinder[Ag5(L)2](PF6)5 obtained from the pentaphenylpyrrole-bridged pentaimidazolium salt H5-L(PF6)5 and AgI ions was determined by X-ray diffraction analyses.The target organometallic cylinder not only exhibited enhanced fluorescence emission in dilute solution at room temperature but also showed an improved phosphorescence ratio compared with the free precursor and maintained a long lifetime(1.39 s)in the solid state at 77 K.Furthermore,the experimental results and DFT calculations confirmed that the formation of the organometallic cylinder promoted intersystem crossing.Meanwhile,the frontier orbitals of[Ag5(L)2](PF6)5 showed the main contribution of building block PPP as the luminescence source of[Ag5(L)2](PF6)5 by a modest heavy-atom effect.These results provide a strategy for constructing enhanced phosphorescent emission and long lifetime organometallic supramolecular phosphorescent materials.

关 键 词：N-Heterocyclic carbene Organometallic cylinder Pentaphenylpyrrole Low-temperature phosphorescence 

分 类 号：O64[理学—物理化学]